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Ouvrages Année : 2019

PB 8783: the first sdO star suitable for asteroseismic modeling?

Valérie van Grootel
  • Fonction : Directeur scientifique
Suzanna K. Randall
  • Fonction : Directeur scientifique
Marilyn Latour
  • Fonction : Directeur scientifique
Peter Nemeth
  • Fonction : Directeur scientifique
Gilles Fontaine
  • Fonction : Directeur scientifique
Pierre Brassard
  • Fonction : Directeur scientifique
Stéphane Charpinet
Elizabeth M. Green
  • Fonction : Directeur scientifique

Résumé

Pulsating hot B subdwarf (sdB) stars, which are core-He burning objects, are one of the showcases of asteroseismology. Thanks to the combination of rich pulsation spectra and state-of-the-art modeling tools it is possible to tightly constrain fundamental parameters such as the stellar mass. There are on the contrary very few hotter sdO pulsators, which are in a more advanced evolutionary stage. Some of them are identified in Globular Clusters (GCs), but they are extremely rare in the field. Recently, it was suggested that PB8783, one of the very first sdB pulsators discovered in 1997, may in fact be an unrecognized hot sdO star with very similar properties to the GC pulsators. We present here new very high-quality spectroscopy of PB8783 as well as an asteroseismic analysis of the pulsator and answer the question: is PB 8783 the first sdO star suitable for asteroseismic modeling?

Dates et versions

hal-02363818 , version 1 (14-11-2019)

Identifiants

Citer

Valérie van Grootel, Suzanna K. Randall, Marilyn Latour, Peter Nemeth, Gilles Fontaine, et al. (Dir.). PB 8783: the first sdO star suitable for asteroseismic modeling?. 2019, Proceedings of the PHOST "Physics of Oscillating Stars" - a conference in honour of Prof. H. Shibahashi,, ⟨10.5281/zenodo.2241553⟩. ⟨hal-02363818⟩
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